<template>
	<el-container class="home-container">
		<!-- 头部区域 -->
		<el-header>
			<div>
				<img src="../assets/shop.png" />
				<span>网上购物后台管理系统</span>
			</div>
			<div>
				<span class="username">{{ userinfo.username }}({{ userinfo.role == 'admin' ? '管理员' : userinfo.role == 'normal' ? '用户' : '商家' }})</span>
				<el-button type="info" @click="logout">退出</el-button>
			</div>
		</el-header>
		<!-- 页面主体区域 -->
		<el-container>
			<!-- 侧边栏菜单区域 -->
			<el-aside :width="isCollapse ? '64px' : '200px'">
				<div class="toggle-button" @click="toggleCollapse">|||</div>
				<el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" unique-opened :collapse="isCollapse"
				 :collapse-transition="false" router :default-active="activePath">
					<!-- 一级菜单 -->
					<el-submenu :index="item._id + ''" v-for="item in menulist" :key="item._id" @changeMenu="refresh">
						<!-- 一级菜单的模板区域 -->
						<template slot="title">
							<!-- 图标 -->
							<i :class="item.icon"></i>
							<!-- 文本 -->
							<span>{{ item.authName }}</span>
						</template>
						<!-- 二级菜单 -->
						<el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem._id" @click="saveNavState('/' + subItem.path)">
							<!-- 二级菜单模板 -->
							<template slot="title">
								<!-- 图标 -->
								<i class="el-icon-menu"></i>
								<!-- 文本 -->
								<span>{{ subItem.authName }}</span>
							</template>
						</el-menu-item>
					</el-submenu>
				</el-menu>
			</el-aside>
			<!-- 右侧内容主体 -->
			<el-main>
				<!-- 路由占位符 -->
				<router-view v-if="isRouterAlive"></router-view>
			</el-main>
		</el-container>
	</el-container>
</template>

<script>
	export default {
		provide() { //父组件中通过provide来提供变量，在子组件中通过inject来注入变量。                                             
			return {
				reload: this.reload
			}
		},
		created() {
			this.activePath = window.sessionStorage.getItem('activePath')
			this.userinfo = JSON.parse(window.sessionStorage.getItem('userinfo'))
			this.getMenuList()
		},
		data() {
			return {
				// 左侧菜单数据
				menulist: [],
				iconsObj: {
					125: 'iconfont icon-users',
					103: 'iconfont icon-tijikongjian',
					101: 'iconfont icon-shangpin',
					102: 'iconfont icon-danju',
					145: 'iconfont icon-baobiao'
				},
				isCollapse: false,
				// 被激活的链接地址
				activePath: '/sets',
				userinfo: {},
				isRouterAlive: true //控制视图是否显示的变量
			}
		},
		methods: {
			logout() {
				// console.log(window.sessionStorage)
				// 清空token
				window.sessionStorage.clear()
				// 跳转到登录页
				this.$router.push('/login')
			},
			// 获取所有的菜单
			async getMenuList() {
				const { data: res } = await this.$http.get('menus',{ params: {roleName: this.userinfo.role} })
				console.log(res);
				if (res.code !== 200) return this.$message.error(res.msg)
				this.menulist = res.data;
			},
			// 点击按钮,切换菜单的折叠与展开
			toggleCollapse() {
				this.isCollapse = !this.isCollapse
			},
			// 保存链接的激活状态
			saveNavState(activePath) {
				// console.log(activePath)
				window.sessionStorage.setItem('activePath', activePath)
				this.activePath = activePath
			},
			reload () {
			    this.isRouterAlive = false;            //先关闭，
					this.$nextTick(function () {
			        this.isRouterAlive = true;         //再打开
			    }) 
			},
			refresh() {
				this.getMenuList();
			}
		}
	}
</script>

<style lang="less" scoped>
	.home-container {
		height: 100%;
	}

	.el-header {
		background-color: #373d41;
		display: flex;
		justify-content: space-between;
		padding-left: 0;
		align-items: center;
		color: #fff;
		font-size: 20px;

		div {
			display: flex;
			align-items: center;

			span {
				margin-left: 15px;
			}
		}

		.username {
			margin-right: 20px;
		}
	}

	.el-aside {
		background-color: #333744;

		.el-menu {
			border-right: none;
		}
	}

	.el-main {
		background-color: #eaedf1;
	}

	.iconfont {
		margin-right: 10px;
	}

	.toggle-button {
		background-color: #4a5064;
		color: #fff;
		font-size: 10px;
		line-height: 24px;
		text-align: center;
		letter-spacing: 0.2em;
		cursor: pointer;
	}
</style>
